Well drill



Aug. 19 1924.

G. GRIESCHE WELL DRILL Filed Sept. 26. 1923 INVENTOR Patented Aug. 19, i924.

GUSTAV GRIESCHE, OF. BERKELEY,v CALIFORNIA.

WELL DRILL.

Application led September 26, 1923. Serial No. 664,927.

To all @1f/wm it may concern.'

Be it known that I, GUsTAv GRIEsoHE, a citizen of the United States, residing at Berkeley, in the county of Alameda and State of California, have invented new and useful Improvements in Well Drills, of which the following is a specification.

This invention relates to rotary wellboring tools, and in particular to the drill for the boring of the well.

Some of the principal objects of my present invention are: the provision of a rotary drill having as an integral part thereof, a longitudinal core of abrasive material as the cutting agent of -the drill; to form the said core with branches of the same abrasive material, for ensuring peripheral clearance'of the drill as the drilling of the well advances; to form the core with a hole therethrough to feed a lwater supply to the out-ting face of the drill; to form the drill as a shell or housing, having one or more longitudinal ports for the passage and delivery therethrough of the resultant drill cuttings; and to provide flushing means to carry the said cuttings to the top of the well and out.

I attain the above objects by the novel construction of my drill, and other objects and advantages of the invention will appear in the subjoined description of the accompanying sheet of drawings, in which:

Figure 1 is a view in elevation of the drill in its normal position.

Fig. 2 is a vertical elevation in section taken on a plane through the axis of the drill and at right-angles to the view of Fig. 1.

Fig. 3 is a top plan of Fig. 1,`and Fig. 4 a bottom lan of it.

Fig. 5 is afull top plan of Fig. 2, and Fig. 6 a fulltra-nsverse section of Fig. 2 along the line 6 6 thereof. Y

Referring tothe drawing and figures thereon: The numeral 1 designates the body of the drill, here shown as.a cylindrical shell housing the elements of the invention. The body is preferably made of soft cast steel for a urpose to be later described. The casting has a series of transverse holes cored therein communicating with a central pngitudinal cavity shown to advantage in Into the cavity and holes an abrasive mass the drill. This mass constitutes an abrasive longitudinal core 2 with lateral branches 3 to the outside of the shell as at 4. Here the transverse holes may flare outwardly, to form a larger abrasive area in the nature of spot-faces for clearance-cutting in the operation of the drill.

The abrasive core is the cutter of the drill` and consists preferably of a mixture ot' crushed steel. granite chips and Portland cement; the latter in combination with the proper amount of water is the binder for mass.

The head of the drill may be connected to the string of boring tools (not shown) by any of the well-known means, such for eX ample as with the threaded coupling 5.

The drill-head has a central hole 6, which is a continuation of the hole in the drivestem 7, and the drill has a smaller hole 8 cored through the abrasive core 2 and which communicates with the drill-head hole 6. To form the hole 8 in the core 2, a tube 9 or the like may be placed in the desired position in the cavity and the abrasive mass compacted around it. It is desirable to` have the latter hole 8 ott1 the axis of the drill, as shown clearly in the top plan views, for eccentric motion in cutting while water is fed through the `hole to the cutting face 10. otherwise, if centrally positioned an uncut core would remain and which would plug the liquid supply hole.

Wit-hin the shell of the drill, one or more ports 11 are cast to serve as passageways for the delivery of the out materials from the well. The ports arev spaced apart and positioned on opposite sides of the column of staggered branches.

Near the top of the drill and atv the exit of the ports 11 are holes 12, preferably in an .upwardly sloping position as shown in Fig.

l, and which holes communicate with the central water supply hole 6. The purpose of these holes will be present-ly set forth in the operation of the drill. It will be observed from Fig. 6 that. th

abrasive core extends to the wall of a port as at 13, but the branch above and below this section extends to the opposite wall, thus a staggered column is formed effecting an eccentric. cutting face as the drill Wears in service.

VIn operation, the assembled boring ri is may vbe formed as a xed integral part of positioned over the chosen spot to be dri ed 2 to the @atterrare 10.

fpresentmg a This action causes a hole to be ground ,on the said spot, the `hard abrasive and soft castpsteel lwearing evenly, and'slowly liber-` ating particles o themselves but always Y Athe lendth of the drill as it wears away.

In. the `rotation of kthe drill the groundaway material is swe t into the ports 11, whose mouths are in t e plane of t e eccentric'cuftting-face 10, `suincient spent Water entering lthe said mouths to carry the fluid materials to the top of the ports; here a Sufficient and bigger volume of circulating watery is forced in an upwardly direction through the holes 12, boosting and carrying the said materials to the top of the well and out.

From the foregping description taken in connection with t e accompanying drawin the advantages of the constructionl an method of operation will be readily under` stood by those skilled in the art to which thepinvention appertains, and while I have described the @principle of operation, y to gether with the /devlce which I now confresh cutting-face throughout lowing: a 1. well boring tool comprisingl a body having discharge ports therethroug and anv abrasive cutting core therebetween, said core having an eccentric hole therethrough, and said body provided with a central hole at its topwith branches leadin therefrom to'the eccentric hole and to the ischarge ports, for effecting the feed to the cutter and the dischs'ge of the 'cut materiall from the tool and we 2.A A well drill comprising a cylindrical body provided with a plurality of through discharge ports within the cylinder, the said ports havin therebetween a. cavity adapted to receive a rasive material, the said material being the cutting agent of the drill.

In testimony whereof, I aiiix my signature.

GUSTAV GRIEscI-IE; 

